F17 using Grub2 or Legacy Grub for EFI?

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http://forums.fedoraforum.org – I've had Win7/Fed16 dual boot on GPT with EFI motherboard for about a year. Things were working quite well. There were efi boot icons on the NVRAM for each OS. All are 64b on a 64b machine. I could boot either OS directly from the mb menu, or through Legacy grub under sda1 as /boot/efi/EFI/redhat and so on. Recently due to some problems I refreshed F16, but it kept saying "You have not created a bootloader stage 1 target device." I've seen postings about this error message. It seems inappropriate, because a "BIOS boot" partition is not necessary when you're bootin (HowTos)